<?php
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

$y = new ArrowFunctions();
$af = fn(ArrowFunctions $x): callable => fn(?ArrowFunctions $z): ?ArrowFunctions => $x->test();
$af = fn(ArrowFunctions $x): callable => fn(ArrowFunctions $z): ?ArrowFunctions => $y->test();
$af = fn(ArrowFunctions $x): callable => fn(?ArrowFunctions $z): ?ArrowFunctions => $z->test();

$object = ArrowFunctions::new();
echo (function($z) use ($object) {return $z + $object->getNumber();})(2);

class ArrowFunctions
{

    public function test() {
        echo "test" . PHP_EOL;
    }

    public function getNumber(): int {
        return 100;
    }

    public static function new() {
        return new ArrowFunctions();
    }

}
